Function module 

pub fn module(lua: &Lua) -> Result<Table>

Register the flow module table with Lua.

v0.0.3 full impl — exposes:

• flow.version (= string): crate version
• flow.eval(node_table, ctx_table, dispatcher_fn) -> result_table: Lua-side entry to evaluate a flow.ir BluePrint with a Lua dispatcher fn

Lua usage

local flow = require("flow")  -- or set via lua.globals():set("flow", module(lua))

local node = {
  kind = "step",
  ref = "uppercase",
  ["in"] = { op = "path", at = "$.input" },
  out = { op = "path", at = "$.output" },
}

local function dispatcher(ref, input)
  if ref == "uppercase" then
    return string.upper(input)
  end
end

local result = flow.eval(node, { input = "hello" }, dispatcher)
assert(result.output == "HELLO")